Oil shown in $($Figure $1)$ flows through the reducer such that particles along its centerline have a velocity of $V=(4\mathrm{.}5x+4t)in\frac{.}{s},$ where $x$ is in inches and $t$ is in seconds.

Determine the acceleration of a particle at $x=8in.$ if it arrives when $t=3s.$

Express your answer using three significant figures.

$$

in$.\frac{?}{s^2}$

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$1$ of $1$